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fix(core): fix issue tracking index on array items

I suspect the range wasn't rerendering correctly after certain
operations (most notably deleting the first element of the array),
causing the sortable state that enables drag and drop support to become
corrupted. This resulted in drag-and-drop rearranging starting to fail,
despite the model being properly updated in zustand.

Instead of computing the index by adding the offset to the start of the
array range, we useArrayIndexFor to look it up directly in zustand. This
more reliably triggers rerendering and thus keeps the sortable state true.

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